Samsung SCS-26UC4 has been working for many months but I recently reset it and no GPS signal (solid red light) appears to be available. I've even run the external antenna outside and it still will not connect.

Thanks for providing the signal indicators! That helps big time. Your indicators are showing positive results. Did you unplug the power source to reset it? What happens with the GPS? Is it the wrong location appearing? Is it still boosting your signal?